Photos: Mass shooting at D.C. Navy Yard

Updated 3:36 PM ET, Wed September 18, 2013

Photos: Mass shooting at D.C. Navy Yard30 photos

Mass shooting at D.C. Navy Yard – A police officer runs near the scene of the shooting rampage at the Washington Navy Yard on Monday, September 16. Authorities said at least 12 people -- and the suspect -- were killed in the shooting.

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Photos: Mass shooting at D.C. Navy Yard30 photos

Mass shooting at D.C. Navy Yard – A U.S. Park Police officer stands guard near the scene of the shooting.

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Photos: Mass shooting at D.C. Navy Yard30 photos

Mass shooting at D.C. Navy Yard – Military security observes the scene from a nearby rooftop.

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Photos: Mass shooting at D.C. Navy Yard30 photos

Mass shooting at D.C. Navy Yard – The White House flies the U.S. flag at half-staff following the shooting.